CALIBRATION OF SENSORS
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In order to perform the calibration of the sensor, the mode button was pushed once, then the "1" button remained pressed until the screen showed the label "cal"; after these steps the sensor was set to the desired pH, in this case 7 because it was calibrated using distilled water. Finally the mode button was pressed again. The sensor was placed under the calibration liquid, in that moment it started measuring the pH of the liquid and it matched to the initial set point.
The following video shows the procedure performed to achieve the calibration of the sensor.
Video 2. Calibrating a pH sensor for the Amatrol's T-5554. Obtained from https://www.youtube.com/watch?v=8jz-4lXU_w8
Instituto Tecnológico de Estudios Superiores de Monterrey Campus Estado de México.